dt-binding: memory: pl353-smc: Fix the NAND controller node in the example

dt-binding: memory: pl353-smc: Fix the NAND controller node in the example

To be fully valid, the NAND controller node in the example should be
named nand-controller instead of flash, should be at the address @0,0
instead of @e1000000 and should have a couple of:
- #address-cells
- #size-cells
properties.

The label is being renamed nfc0 as well which is more usual than nand_0.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210610082040.2075611-8-miquel.raynal@bootlin.com
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>